Draw an array that shows why 20∙19=20∙20−20∙1. Also, use this equation to help you calculate 20∙19 mentally.
Draw an array that shows why 20∙19=20∙20−20∙1. Also, use this equation to help you calculate 20∙19 mentally.
Chapter8: Arrays
Section: Chapter Questions
Problem 6RQ
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Draw an array that shows why 20∙19=20∙20−20∙1. Also, use this equation to help you calculate 20∙19 mentally.
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